Friendly is good, so don’t worry so much about it and train hard. Make them scared of your fists not your face.
Remaining emotionless is usually the most indimidating thing you can do. Doing that tells your opponent you aren't afraid of him and it puts it gives him a feeling of unknown about you. The only thing to actually help your appearance is getting a buzz cut and growing a beard if you can.
Why do you want to be like everyone else? Be yourself? Sometimes there's an advantage to looking like the innocent kid. It won't always help but if folks think you're a push over it'll give you a bit of an advantage for those who think you won't be a hard fight
squint your eyes no bs it makes everyone look meaner im somewhat like you im built but i have a "friendly face" but when i squint my eyes people say i look mean as hell lol they ask me stuff like "how come every time i see you you look like your about to blow up the school" " or "why you always look like your about to beat tf outta someone" also looking people straight i there face intimidates some people but some people (Like me) consider that more so as a threat so be carefull who you do that too add a smirk to it every once in a while lol works for me
Go bald and grow out your beard.
hi, i am training MMA, but i dont look mean. I have light brown hair , a bit freckles on my nose, and lets call my face cute. When you would met me , i and i tell you i train MMA, you would laugh. I have strong body, but face and MMA just arent going together. When i see wand, sonnen,quinton jackson or other fighters they look mad and mean. Like they really want that fight and like that guy killed their mother. How to get that look in MMA fight?